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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7715966d8015c25a4b457dcb19947f2edb7f1d2f9c4861016a140e763c9b9c1' 
  AND token = '0dbo7N/pfuJWDv3ZtxJ4zilp0irudA/UgSXGe3YfjSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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