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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56955574f5dbfa2ef2ff8a6d6a6c5a09f1016a0bbcd2ef0d72770b85746f8062' 
  AND token = 'PgW6KRZMpHvq+re3h6VpLRuQ2wfhWDkW4sR8oHclWfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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