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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a55db48a15adf4c7867e50ee6b21a91b80bf6c8fc7e656f6a54acc3e1945d5' 
  AND token = 'AvZLgjDfqF+eELtUSWvggEvf/Os4voXpEEjAQbYFkLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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