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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a26b4859b4d8a3b072620bb400b92f2275f3775d83f84f7b67029046c9e2f4' 
  AND token = 'Zwf3B9u5mtC03CEuxhHWsenOb9L5+rOgtEs4Cr8DSRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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