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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d5fde98e820ff3af9602a12f83c05aa723a61b3035cac3b9468115982f331c' 
  AND token = 'CYty/zqVlznYNVDUafCyVcPdT3pn7p5+kLO4Va4VkvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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