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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd050a52950816a9d8c7dc2cc99d55b850c74a359c53bd8259da530ea0d9344a' 
  AND token = 'oRcqfhTOMz8k15oFevNvub+X9y/GPwDRPLtMYQYF8Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}