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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde063bcc1ad9fd2b0f567186a459532e7b23d8b59c082ea4419177c7e83d226' 
  AND token = '3uJM3UNoXcJybLXhKOHJEHhP6hBKIScRNaXdOOyYlWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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