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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2471b35fba32c3503d68c2f20218fee1e846e17e4d4fc0446f24f55df18f9f9f' 
  AND token = 'MnNcgwPv3XegQCusbmTEolrzVFU0YRf7OapbLZa1YTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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