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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ad22169677c556730034d724c871a92e2b7c572f87aeda58dee0ad6a1decca' 
  AND token = 'iSY1uuqYI2ZOxuzycy0YM3JMGy+Y1Jw1WZ5llu+IPjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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