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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d5552f46654fef855e039872d77a43f2e7d13c8f24fecf2b758b29707a07ee' 
  AND token = 'URnxfa2L9Xkk7ynU//x+nO71xxpFLHKJWcoxciio5lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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