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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684709e50103e35c2520601f4e26676a08c1bff7c7e256c7f70985925b9d7924' 
  AND token = '88OH0D13h71pocQipoS4/2HWFxbcG3HqnW+PHPxCrT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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