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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc613dfa5ffa409262192ee12e906e493e2e0de5d3d059542a98893b392e966' 
  AND token = '3QqSiFyUb4D2fGCH8OEzLj4ldatzBk0E8cBdSQGFncA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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