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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6ed8300327229125db4ff96d4bd11e20bf8f41cfb944e3e60133ffd987bf59' 
  AND token = 'FQbOeSKibKXg6/IXChUjCVBNlYo4pNOn6PFafgri3fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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