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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c8d7e1e2fb175fd5946a121cd00016559cc3aff4afa9c5fcdf4aad4fe3afdf' 
  AND token = 'czCaHS0GeAjDSQ+84BWCXl21BHLaoNv1PcByflbKLoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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