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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c453b563b55e0fe1e8aeb83df6170c288dd29bb3c333232476a390edb365d856' 
  AND token = 'Zul5PWS3cjU1tniy2h8oHR2xPsUSflGLjHgChcF4ioY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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