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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd59e5de49da5384e49c41e1d8d9b1ae48e0d2380ea9b6306632a47ae81a47e' 
  AND token = 'R4Z3pztjxPAv4Cx4bUPn0cA5Wy9vhtD+QCzTbgRXrXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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