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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b1dfe9bdcc842a91f9dbab6669e5537d639c81f59126d8208efebfe2ef51b0' 
  AND token = 'qI95vdXA2es0gLIrdYBiV4m07RVvmEc6iuQDdD4QyOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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