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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1addd0a657b61cc70fde7c60283b1fdf6fd601a4fce6fd9f4dc4375e21ffdbe' 
  AND token = 'FZGrSCwQljsNijlZo/TKUU9NxkF07AEdc7f+xQL8lgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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