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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f567b232cb9bd07020f0b674240da71f56f1992ba79356d4452d5ff752728c71' 
  AND token = 'ilJk7SPOirNnjwSbFRIvZc8v+jXUAOO4IATx5XVPVGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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