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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fda5548e5a46d8b80f1ed74c80130380888922ff261506cc4bc0b2935bcf9c' 
  AND token = 'ZG2Vkn1aEuzgRhx3CQxgJ6gmzuPXdEwGz43a0wf+4+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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