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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c463f710507a949579ec92bf8cc0fb43a9763093a6612fe83541959cdde9ae' 
  AND token = '+7MsoHkm4/lVYuDMYh/0FL/stO157EIdmbOY9aYU/8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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