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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631b69b6a0bfaf672ad0251103c48bcc0cd8dd50c329cf75904eac2f71905079' 
  AND token = 'jsmu2C2XVfMnTK1fYX5tvWEOQ5QmbfIS5wgdhXxkYYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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