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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c377f4450b0768276001980ad8cdb901b79970ba41b0f0e33557ac75944357' 
  AND token = '1DHvPyIx+DzzhdEeLYw97ojDFwNvHrxwrmqHHbzR+wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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