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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b475db29753c15941771a2563580447b975e706d9e5791e1df554b14ac01e108' 
  AND token = 'Wcgzd7jwwY2a+anuhQBDZZ+B1gWN3M73wfta11BgPVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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