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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8db67adfe55e24b586d963060b4d65c8c83671e28fe93d753c6f76f7719d5d' 
  AND token = '0dp7a4PVnlrZvFcFh1q0vTl7n2L0xMw0i0GluSQNMD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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