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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4812cb539a1403255152f58f14010032864dfb4234ea473973e2ff750678e2' 
  AND token = 'Fb0vkdO3RwSDPRUz/B5GJuvBZQrEGouDTo62u3Mprlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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