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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2963ffd2e93ed9a23099757389696bf2d7540a53269f5a6f07c169e5ab8ed4ba' 
  AND token = 'aIk7M2N0rhmbnAThaLDHtXJUzHBzQ8+zA7Fq5M0C9eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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