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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f968cdbcd901d7a36a2d7d291d153f7c36dd71cbb1e7027787e12fe5ed5d72' 
  AND token = '5rGIrGLd38yFjzQIDd5PVINSTxo52MKFebXH/6Hg8Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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