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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee01a739770eb6f73612d3cfb05480934107ed69f65b22f7bd9f40017f3ca9d' 
  AND token = 'XX16Lml4QOnK70Cxl5vwWYn15MLqUEyGYWPWbizvPig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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