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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c677e9a1a3d003012e70f1dc7ae74fc7056d5210e2b69d64aaa52ef02347b85' 
  AND token = 'ogFTQddcurM9gEO5kZ4XWVVWr+Wn2+RgE1RXH8v6k2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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