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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbe1125e0448ca12a0d83d57d7e29b47c56e962293bdeb79e5e27eff3bbd93c' 
  AND token = 'TW98W/odZEFrGI4ytW/yY9Pii42s8l9m7nVEQ+pqGP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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