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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6e6c90c40bae904c5f8317a6a69fea74aea603d8bc36b29593fe76529c3e23' 
  AND token = '3fqS3DLqoDlCzrhx/kRu4kyDppg7u5a0uaixcVJBr9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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