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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daaddbf7318c214ba17a7ebb2b633068cd278f6aa7c82de2a1ed942118dc7d9b' 
  AND token = 'QjEV3OFLo6aO7hEkGtrB4nSg5Pz7a9aM+zG8NWKMgJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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