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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dee051adb8046dfdafc1361358307dc5ee3ac5cd7b606eb8937c45c2deed06c' 
  AND token = '2WiiTb2ohwJmsrPj4JDehhzYnV+b5hf7u4OECi2dZ0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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