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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f78dd7de44e544d2c192a87001ee8cc06f4d4105f19f6f1ebd3131d67764ae7' 
  AND token = 'HX2LhfKAl4QqQdElFFVBYsGXLfIJ5ISv6Phc2Mlk1/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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