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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5ed7557dad11dccac554a2cf78f027b14c351c5516e14343e0a61a00daed97' 
  AND token = 'qOtC6pZyVcuCHeFVLWdgx2y7VIpG45lkxVTjgkOxJNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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