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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c9765888c1044843b07c8c118aa5a819aa28a4952d0eb09b82fa8947b8cbf9' 
  AND token = 'cBhLV6mo6xJ18QJfLbsNfmgKLFRRcAciH94m9LwxCvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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