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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb5503d029773e8975205bb60606878e35c5da6d06de80cfa972bcc642343fc' 
  AND token = '8svv2VCySkHVO+PhbZ7L9h0ZxtqcR4OPn3yFBGgwne4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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