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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecac3089ec51730bf93ce7427145af5120ca5b486f9f4baeb8c4ad26326a4d5' 
  AND token = '6NlH3Cj9jDbkixyBD+D3BpDUpfegfrxF00c2dAd7MQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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