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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '122f0a03e6db884e8596a449ba4f46f5ce5e3781974076dcb906c1007d338044' 
  AND token = '+WjgYg18QM/TeqrWvaxJOwnYXst0q4wjlR1RWPx/FWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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