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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e7a112441d47ec76b17231845c9bf13c67fd62dabc9ebd82fd0a8c8f3b5125' 
  AND token = 'reVLwOuRGjIiRGqszsbtUXwq7N1FuaaCMjvti1E+GxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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