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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948bc94ea1fff85a86ffea4bf110fbfcec4ea4f76a988b6c21eb8dec7ed48f99' 
  AND token = '3HD9PzsRY76Hx3wuC6f/yiWlO3aSreluDN/4TaVPp2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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