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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba9f58355ca33ca250d36c41f06f7f548baa8573c063346ee14aa3ed04cc86a' 
  AND token = 'Bag0ZQ38GxyHquoXXzW2hlgsFb4yxzqIXoUe+Xz0fTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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