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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e99da85c568e81d2bd02b7dd551b1449564202e33aace31e7d71563d2d2447' 
  AND token = 'R130hh/hLbKYRg3MEhR7CPeSc8uxNkFMhwVCVMZ+IHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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