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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28c7b19946c415bd5f78c129725cbaaafc128e33eeac93887f230c6eea6d053' 
  AND token = 'sKDxovYan3XmVpGfo5XfjgzEPmgYoj3Hy5k2/SEvzzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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