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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7663e1a7853eb6dd0d271c7cb494a08ed07b7e8b09e40e4f1240f9b7ab8b42e0' 
  AND token = 'f/2vJ45V9TMtJqGc7G4EiI5K6F0Z8xYmgePzS04JJag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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