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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d6ab8ffedde484602dd70d94a3bd18b6a315247b35bc7c72ec7902d904c0ca' 
  AND token = 'NYkNw4iHgQh3hI6i5u04LdZqGVe90vf4LYNyz/MQBiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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