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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8411ba099f4ae2d0d4a869e15794c35965bcc330fff9161647a2e48f0c322768' 
  AND token = 'fJrQ0APr8h/ZmDOaiJzLFP4sA+1+EU9sriYHF58VxSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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