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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b43fd26e185976affd5e890d49ebe43f7ae2663856943d45d35de0b83c2da2a' 
  AND token = 'zaTQCMc6Yg7VZc2h9pEGrKfUFoqZV2WxyHP1eR/aVkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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