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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f133c732a5d02b1b4ebdc7b77fb7c1dc283cdc07f9f96781ebfe95155abb2971' 
  AND token = 'ZnSHZIQY/dCDsDeCbWi5HTax54xsxIUT1osJdrHxbTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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