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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52f8eccc2beb23eb7e023ae7a1553c5b7f9be6d1943409b65fa86f55a1736dcd' 
  AND token = 'cPs441ZuvHu3G7fpudiJNr4MDUGNgof6dShzFDMFchY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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