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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad1be5f95f5a46875a5fb558e68e2af214e3bf5a1165f596c3ec9b7470097ec' 
  AND token = 'kKSVahgqHSNL3E2FdphSvwo4eHOAIUdztgczEzsl6F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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