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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abef539a4f732290e63cbe38d115be98a6c808f2cf5ce9cc287d78ad0449c8d5' 
  AND token = 'nPvZ6RQcXZOV3F8oPnIGj2cLMO85Zx4A8DDDsKecQSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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