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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50025af1f870d5a9e7de2b6ef4fb7bdc9765c8f73b73731029556a7e331855f' 
  AND token = 'ivJo1bLYSn6sdZ9o7x7hV15pHL7OY6bpyzWZm0ZhvLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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