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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fe2581b5d09658a6df7f2b25e29f67a3fa1dc24624f5e2b7e93e21ed35d800' 
  AND token = 'W6m3cyB+riHnb5RACxIBDIC0GkhNbnS2v12DAxuvz9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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