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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8104538c01616b3fd953461101be6c7f2b5641f7c1a17daf28b8faf02d7518d' 
  AND token = 'ErD2gwbjpt3IT5IWXPqs8zcvcjvb8tK6302qSZBLt1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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