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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897c10c4d1cd0809fe158829f1274ee6f2a5314bd547ef04c66eb5fecd105a6c' 
  AND token = 'dl2KpV1CORa6QCogLM/wTdzED+2M76fwcY+FXXFoSo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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