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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcb0a8ab40b05a9c764354cbc54c6144c0c59e87ea7fb48b502cd73655589bca' 
  AND token = 'dcIEiThOJ5jJBpdTxILC5BuasFhHqgqtoUgYSvatIXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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