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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cf84e97f41a07c614ddbc42d032e0911b76f63fd92e6715029b2d33fdd76a3' 
  AND token = 'jZ7df3DXZmRqCLapkoNhN+5uoh6rVsjMtdRFt8Tkozw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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