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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '260a618ca24890e2b4c09c29c4a1fe48fdfd4b3c6469be292d23df2ea9efce40' 
  AND token = 'JSAwQuWXlQ6GZyEgo8qGuYQIVbOa2X5zUN7ft13ClUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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