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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f87e3235ab460883b088189e8c9b2038f0c57f46fa19a9484ccfe5d3175e9b6' 
  AND token = 'c+AIRDOdWcrkfEBSwz+MlUAMUbjTCtPE1tuQhQjXc8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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