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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d3f1632a3f2176244c6a16740f2501f126d579e0deff1409f1772a9e58353a' 
  AND token = 'waG3S2TaM4a1EXIq7BEvtx2z7M6VeHu2AEDkGgqVmOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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