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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd89804544541ed5fba409ccd530f99d2ba1e77554199d0bcb256a6deb5ef24' 
  AND token = 'GYrE/3U3WVKg0zJbhWnrFlz/CO4I0Rkn+1D74O4q5V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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