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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92fcc063854fc9f5b676a9da18dc08677b43b6923577edd58e30f8257a4e6ee' 
  AND token = 'BRTR4g+RRQmMnPgJboBPXvMyxOqRtMPaTPD1ND3Lim8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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